82 APPENDIX. 



longer than broad ; hemelytra long and narrow ; membrane with 

 the venation much as in Letliceus-, anterior femora moderately 

 incrassate, finely spined beneath near apex ; tibiae spinulose ; tarsi 

 with the basal joint as long as or longer than the two remaining 

 joints together. 



To be placed near the genus Lethceus. 



2857. Abanus coloratns, Dist. A. M. N. H. (8) iii, p. 493 (1909). 



Head, pronotum, and scutellum dull black ; extreme lateral 

 margins of pronotum more piceous than black ; apex of scutellum 

 ochraceous ; body beneath dull black ; rostrum piceous brown, its 

 basal joint and apex black ; coxae and legs more or less piceous 

 brown ; clavus pale piceous black, corium castaneous, an inner line 

 before clavus, lateral margin for about two-thirds its length, and a 

 transverse fascia before apical area pale ochraceous, apical area 

 black ; membrane piceous black and not quite reaching abdominal 

 apex ; antennae brownish ochraceous ; structural characters as in 

 generic diagnosis. 



Length 9 millim. 



Hob. Bengal ; Chapra (Mackenzie). 



Genus USILANUS. 

 Usilanus, Dist. A. M. N. H. (8) iii, p. 341 (1909). 



Type, U. burmanicus, Dist. 



Distribution. Burma. 



Head somewhat long, subtriangular, about or almost as long as 

 the anterior lobe of the pronotum, the central lobe distinctly 

 produced and projecting in front, ocelli near base, much nearer to 

 eyes than to each other ; antennae with the first joint moderately 

 thickened, shorter than head but passing its apex, second, third, 

 and fourth joints almost subequal in length ; rostrum reaching the 

 intermediate coxae, first joint slightly passing the base of head, 

 second not reaching the base of prosternum ; pronotum shorter 

 than breadth at base, the lateral margins obliquely rounded, 

 transversely impressed behind middle, the anterior margin scarcely 

 or only slightly broader than the eyes, the anterior lobe subglobose, 

 the basal area or posterior lobe coarsely punctate, faintly, centrally, 

 longitudinally ridged, and here the lateral margins are a little 

 laminate, posterior margin distinctly concave before scutellum, 

 the anterior margin truncate ; scutellum triangular, slightly longer 

 than broad at base ; clavus longitudinally punctate, corium with 

 the subcostal vein distinctly curved ; membrane slightly passing 

 the abdominal apex, with four longitudinal veins, the two inner 

 strongly curved towards base and reaching basal margin, the two 

 outer not reaching basal margin ; anterior femora incrassate and 

 somewhat continuously but irregularly spined beneath, anterior 



